Watersmeet from the video the Top 15 Tips for Beginners
This is the city of Watersmeet, which was built on the Winding River map from the Map Pack 2 content creator pack.
This map shouldn’t need any mods, but will need many DLCs (Plazas and Promenades, Snowfall, After Dark, Green Cities, Mass Transit off the top of my head)
Further, this map uses the Verde Beach/Tutoria one-Click collection, which can be found here and is not required – store.steampowered.com/app/2148903/Cities_Skylines__Content_Creator_Pack_Map_Pack_2/
